So I decided on the Peerless 831858 that is on sale at madisound. Using Winisd, I have decided to put it in a 32L box tune to 28Hz using two 1 in diameter 4in length ports.

The curve looks pretty flat and the extension and group seems good for music as far as I can tell with my limited knowledge. So how is this setup? Does it look alright? Any comment is appreciated. Thanks!

PS. This is a sub that will be eventually use with a pair of super elf or elf 1.5 as my computer sound system.

I don't have specs of this particular driver to model it in my copy of Lspcad, however 1" diameter ports seems a little on the small side to eliminate air speed noises. May be better to use 2" or 3" ports and make them longer to get required tuning.

never used the winisd online version--i suggest u download the alpha pro and use that.. possibly the online version is estimating at 1w of power---did you enter in the max power you will be deliving to the sub as a parameter as well??

BTW, WINISD has errors in it, so be forewarned! Also, <5% mach vent speed (0.05) is where you need to be for best performance as long as the pipe doesn't get too long for the sub's intended BW. 16% will be audible unless some means is used to damp it, though I've had folks tell me that subs with a 20% calculated vent mach sound fine to them, so YMMV.

GM

__________________Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

Found some specs on this driver. Lspcad shows for this box size & tuning minimum 2 ports 50mm dia (2") by 310mm long (12") - better would be 2 50mm ports 280mm long in a 49.8 litre box - tuning point would be 22.7Hz.